<template>
    <el-container class="home-container">
        <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button></el-header>
        <!-- 页面主体区域 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '64px' : '200px'">
                <!-- 展开按钮 -->
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <el-menu
                    background-color="#333744"
                    text-color="#fff"
                    active-text-color="#409EFF"
                    unique-opened
                    :collapse="isCollapse"
                    :collapse-transition="false"
                    router
                    :default-active="activePath">
                    <!-- 一级菜单 -->
                    <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
                        <!-- 一级菜单的模板区域 -->
                        <template slot="title">
                            <!-- 图标 -->
                            <i :class="iconsObj[item.id]"></i>
                            <!-- 文本 -->
                            <span>{{ item.authName }}</span>
                        </template>
                        <!-- 二级菜单 -->
                        <el-menu-item
                            :index="'/' + subItem.path"
                            v-for="subItem in item.children"
                            :key="subItem.id"
                            @click="saveNavState('/' + subItem.path)">
                            <!-- 图标 -->
                            <i class="el-icon-menu"></i>
                            <!-- 文本 -->
                            <span>{{ subItem.authName }}</span>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <!-- 右侧内容主体 -->
            <el-main>
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    data() {
        return {
            // 左侧菜单数据
            menulist: [],
            // 定义一级菜单的图标
            iconsObj: {
                125: 'iconfont icon-yonghu',
                103: 'iconfont icon-jiaosequanxianguanli',
                101: 'iconfont icon-shangpin',
                102: 'iconfont icon-icon-test',
                145: 'iconfont icon-shuju'
            },
            // 是否折叠
            isCollapse: false,
            // 被激活的链接地址
            activePath: ''
        }
    },
    // 定义一个生命周期函数
    created() {
        // getMenuList() 用来获取所有的菜单
        this.getMenuList()
        // 点击菜单后的高亮
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout () {
            // 清空 token
            window.sessionStorage.clear()
            // 跳转到登录页
            this.$router.push('/login')
        },
        // 获取所有的菜单
        async getMenuList() {
            const { data: res } = await this.$http.get('menus')
            if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
            this.menulist = res.data
            console.log(res)
        },
        // 点击按钮，切换菜单的折叠与展开
        toggleCollapse() {
            this.isCollapse = !this.isCollapse
        },
        // 保存链接的激活状态
        saveNavState(activePath) {
            window.sessionStorage.setItem('activePath', activePath)
            this.activePath = activePath
        }
    }
}
</script>

<style lang="less" scoped>
.home-container {
    height: 100%;
}

.el-header {
    background: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
        display: flex;
        align-items: center;
        img {
            width: 42px;
            height: 42px;
            margin: 0 10px;
        }
    }
}

.el-aside {
    background: #333744;
    .el-menu {
        border-right: none;
    }
}

.el-main {
    background: #eaedf1;
}

.iconfont {
    margin-right: 15px;
}

.toggle-button {
    background: #4A5064;
    font-size: 10px;
    line-height: 30px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>